Question

14. If 2cos3a = 1, then a
यदि 2cos3a = 1, तो a = ...​

Answer 1

Answer:

2cos3a = 1

cos 3a = 1/2

cos 3a = cos 60 degrees ( since, cos 60 degrees = ½)

so, a = 60/3 = 20 degrees

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